Wavelength conversion device

ABSTRACT

A wavelength conversion device disclosed adopts a drive gear and driven gear as a main transmission structure, and disposes optical fiber plugs at a center of the driven gear. When a central shaft of the driven gear is unmovable, the rotation of the drive gear will drive the driven gear to rotate, and the rotation of driven gear will drive the optical fiber insertion rod to move up and down, thereby completing an insertion-extraction operation of the optical fiber insertion rod. When the central shaft of the driven gear is movable, i.e., when the optical fiber plugging rod is completely above the baseplate, the driven gear is locked with the optical fiber plug and thus they both cannot be rotated about their own axis, the driven gear will drive the fiber displacement plate to rotate along the drive gear under the action of the drive gear, thereby realizing the rotational translation of the optical fiber plugs, and reaching the switching wavelengths of laser at the optical fiber output interface. The wavelength conversion device is simple and easy for ordinary medical personnel to operate, thereby promoting the development of laser therapeutic instruments in the medical field.

TECHNICAL FIELD

The present disclosure relates to the technical fields of laser andmedical instruments, in particular relates to a wavelength conversiondevice for photodynamic therapy.

BACKGROUND

Photodynamic Therapy (PDT) is a new technology for the diagnosis andtreatment of diseases by using a photodynamic effect. This therapy isbased on the photodynamic effect. The photodynamic effect belongs to aphotosensitization reaction with biological effects in which oxygenmolecule is involved, and comprises the following processes: aphotosensitizer absorbed by a tissue is excited by the irradiation of aspecific wavelength of laser; and then energies of the photosensitizerin the excited state are transferred to oxygen in the surroundingenvironment, to generate highly active singlet oxygen; the singletoxygen and adjacent biomacromolecules occur oxidation reaction, and thusproduce cytotoxicity, which in turn leads to cell damage or even death.Compared with traditional therapies, photodynamic therapy has manyadvantages including small trauma, good targeting, no drug resistanceand side effects.

Generally, visible red light is used as an irradiation light.Photosensitizers strongly absorb light with a wavelength of 630 nm orgreater than 630 nm. Laser is the most convenient and portable lightsource, and has coherence and mono-chromaticity. That is, a laser sourceproduces a single wavelength of light with the high energy. In addition,an output power of the laser source can be precisely regulated, andlaser produced thereby can be directly introduced into hollow organs,penetrating into tumors through fiber optical cables. Compared withmetal vapor lasers or tuned-dye lasers, diode lasers are cheaper andmore portable, and thus are preferred. The photodynamic treatment timeis related to the light absorbing ability of the photosensitizers andthe effectiveness of energy transfer between light and oxygen.

The laser wavelength and the required energy are variable depending onthe indications being treated and the type of photosensitizer. Forexample, Photofrin is a photosensitizer used for gastric cancer andbladder cancer, and has an excitation wavelength of 630 nm; Metvix is aphotosensitizer used for basal cell carcinoma, and has an excitationwavelength of 635 nm; Foscan is a photosensitizer used for head and necktumors, and has an excitation wavelength of 652 nm; Purlytin is aphotosensitizer used for breast cancer and prostate cancer, and has anexcitation wavelength of 664 nm; Talaporfin is a broad spectrumphotosensitizer used for solid tumors, and has an excitation wavelengthof 664 nm; Verteporfin is a photosensitizer used for basal cellcarcinoma, and has an excitation wavelength of 689 nm; Lutex is aphotosensitizer used for prostate cancer and brain cancer, and has anexcitation wavelength of 732 nm.

The lasers used in the photodynamic therapy instruments are generallysemiconductor lasers which are output through optical fiber coupling.High coupling efficiency can only be achieved through a precisemechanical cooperation between the semiconductor laser and optical fibercoupling output interface and a precise mechanical cooperation betweenoptical fiber and optical fiber coupling output port. When a treatmentinstrument is composed of semiconductor lasers with differentwavelengths, it has many ports for optical fibers, which makes itdifficult to perform flexible wavelength switching.

SUMMARY

In view of the above, an object of the present disclosure is to providea wavelength conversion device capable of quickly and accuratelyswitching laser elements that can produce lights with differentwavelengths.

A wavelength conversion device is provided. The wavelength conversiondevice includes a base and a plurality of optical fiber plugs. The baseincludes a baseplate and a stationary shaft extending upward along acenter of the baseplate. Along with an axis of the stationary shaft, thestationary shaft is provided with a drive gear and an optical fiberdisplacement disk with the axis of the stationary shaft as a rotationaxis. The optical fiber plugs include optical fiber plugging rods, adriven gear disposed at periphery of the optical fiber plugging rods andmeshing with the drive gear. An optical fiber is provided at an axialcenter position of the optical fiber plugging rod; optical fiberferrules are provided at both ends of the optical fiber plugging rod andmay be connected to an optical fiber input interface and an opticalfiber output interface, respectively. A plurality of optical fiberplugging ports for positioning the optical fiber plugs are disposed onthe optical fiber displacement disk at a radial periphery of the drivegear. A plurality of output ports for spirally connecting the opticalfiber output interfaces are disposed on the baseplate verticallycorresponding to the optical fiber plugging plugs. When the opticalfiber plugging rods are located above the baseplate, the optical fiberdisplacement disk is rotated under an action of the drive gear anddriven gear, thereby driving the optical fiber plugs to rotate aroundthe axis of the stationary shaft; when the optical fiber plugging rod isrotated around the axis of the stationary shaft to locate above theoutput port, the optical fiber plugging rod is moved up or down alongthe optical fiber plugging port under the action of the drive gear anddriven gear, so as to pull out from the output port or insert into theoptical fiber output interface.

Preferably, the wavelength conversion device further includes amicro-switch device disposed above the optical fiber displacement disk.The micro-switch device includes a micro-switchgear, a plurality ofmicro-switch elements provided above the micro-switchgear, amicro-motion spring, a limiting ball and a micro-motion rod. A pluralityof micro-motion holes are provided on the micro-switchgear, and themicro-motion spring, the limiting ball and the micro-motion rod arearranged in the micro-motion holes. The micro-motion spring is sleevedwith the micro-motion rod. One end of the micro-motion rod abuts againsta triggering unit of the micro-switch element, and the other end of themicro-motion rod abuts against the limiting ball. Micro-switchpositioning slots with the same angle as the optical fiber plugs aredisposed on the optical fiber displacement disk. When the optical fiberdisplacement disk is rotated, the limiting ball will move from onemicro-switch positioning slot to an adjacent micro-switch positioningslot. At the same time, the optical fiber plug will be moved from anupper position of one output port to an upper position of an adjacentoutput port. Specifically, the optical fiber plugging ports areaxisymmetrically disposed on the optical fiber displacement disk, andmicro-switch element positioning slots are adaptively disposed in aradial direction of the fiber displacement disk in which the opticalfiber plugging ports are located, so as to ensure that the optical fiberplug can be accurately positioned above the output ports when theoptical fiber displacement disk is rotated.

Preferably, the driven gear of the optical fiber plug is connected tothe optical fiber displacement plate through a bearing housing and abearing of the bearing housing; the driven gear is connected to theoptical fiber plugging rod through a screw-nut pair.

Preferably, a screw internal thread of the driven gear has a lengthlonger than a length of a screw external thread of the optical fiberplugging rod. The screw internal thread can only be screwed inside thescrew external thread. An end of the screw external thread is providedwith a thread stop structure for preventing the screw internal threadfrom being screwing out. When a top of the screw external thread abutsagainst a top of the screw internal thread, an end portion of theoptical fiber ferrule at a lower end is located at least above thebaseplate.

Preferably, the drive gear and driven gear are arranged between thebaseplate and the fiber displacement disk, the optical fiber pluggingrod is provided with vertical positioning slots at a top portion of thescrew internal thread of the driven gear, the optical fiber pluggingport corresponded to the optical fiber plugging rod is provided withvertical positioning protrusions. When a bottom of the verticalpositioning slot abuts against a bottom of the vertical positioningprotrusion, a bottom of the optical fiber ferrule at a lower end islocated at least above the baseplate.

Preferably, a lower portion of the screw external thread is providedwith a spring and a spring positioning shoulder.

Preferably, the optical fiber ferrule and the optical fiber plugging rodare connected through a tapered transition piece.

Preferably, the tapered transition piece has a taper angle of 45°.

Preferably, at least two bearings capable of withstanding axial oppositeforces are provided inside the bearing housing of the driven gear.

Preferably, an external thread is provided on the optical fiber outputinterface for spirally connecting the output port; and/or the opticalfiber input interface is an optical fiber adapter.

Through the wavelength conversion device of the present disclosure, afollowing wavelength conversion process may be performed. Before a startstate, the optical fiber plugging rod is completely located above thebaseplate, and the screw external thread reaches the upper end of thescrew internal thread and/or the positioning protrusion of the fiberplugging port reaches the bottom of the vertical positioning slot on thefiber plugging rod. That is, the optical fiber plugging rod ispositioned at the extreme position (i.e., the optical fiber plugging rodis pulled out to the extreme position in the upward direction), thelimiting ball is located in the micro-switch positioning slot.

In the first stage, the rotation of the optical fiber displacement diskdrives the optical fiber plug to move from the current optical fiberoutput interface to the next optical fiber output interface.Specifically, the drive gear is controlled to rotate in the forwarddirection, which drives the optical fiber displacement disk to rotate,removes the limiting ball from the micro-switch positioning slot, andthus turns on the micro-switch element. The limiting ball is snappedinto the next micro-switch positioning slot of the optical fiberdisplacement disk under the rotation of the optical fiber displacementdisk, and the micro-switch element is turned off. The turning on or offof the micro-switch element controls the backward rotation of drivegear.

In the second stage, the optical fiber plugging rod of the optical fiberplug is moved downwardly to dock with the optical fiber outputinterface. Specifically, the drive gear is backward rotated, and rotatedin a certain turns, which drives the optical fiber plugging rod to movedownwardly to the optical fiber output interface and laser-coupledoutput to the photodynamic therapy device for photodynamic therapy.

In the third stage, the optical fiber plugging rod of the optical fiberplug is moved upwardly to the extreme position. Specifically, when thetreatment is completed, the drive gear is controlled to rotate in theforward direction, and the optical fiber plugging rod is moved upwardlyand gradually removed from the optical fiber output interface, isfinally moved to the position before the start state described above, soas to complete a use period.

The control of the forward rotation of the drive gear may be performedby a control system provided in the wavelength switcher, or may beperformed by the photodynamic therapy device. Specifically, a startswitch may be provided on the control system manipulation interface ofthe wavelength switcher or on the control interface of the photodynamictherapy device. The drive gear is converted from forward rotation toforward rotation during a complete turning on and off of themicro-switch element.

The present disclosure has the following advantages.

1. The wavelength conversion device of the disclosure achieves themechanical coupling and switching among the plurality of input opticalfibers and one output optical fiber through a simple mechanicalstructure. Through the relative positional change among the plurality ofoptical fiber plugs and the optical fiber output interface, when acertain input optical fiber is aligned with the optical fiber outputinterface, laser in the optical fiber connected to this optical fiberplug will be output, so as to realize output laser with differentwavelengths. This device is simple and easy for ordinary medicalpersonnel to operate, thereby promoting the development of lasertherapeutic instruments in the medical field.

2. The wavelength conversion device of the disclosure controls theopening and closing of the micro-switch element by a micro-motionspring, a limiting ball and a micro-motion rod. The structure thereof isskillfully connected with the base and the optical fiber displacementdisk, thereby achieving steering control of the drive gear and precisepositioning of the optical fiber plugging rods.

3. The wavelength conversion device of the disclosure can not onlyrealize the output of lasers with different wavelengths by one opticalfiber output interface, but also can realize the output of laser withsame or different wavelengths by the plurality of optical fiberinterfaces, thereby improving the efficiency of photodynamic therapeuticinstrument.

4. The wavelength conversion device of the disclosure uses a thread stopstructure at the end of the screw external thread to prevent the screwinternal thread from being screwed out, and/or the bottom of thevertical positioning slot of the optical fiber plugging rod abutsagainst the bottom of the vertical positioning protrusion of the opticalfiber plugging port, so as to lock the up and down movement of theoptical fiber plugging rod, and in turn to rotate the optical fiberdisplacement disk to drive the overall movement of the optical fiberinsertion plug.

5. The wavelength conversion device of the disclosure includes a springdisposed at bottom of the optical fiber plugging rod and a springpositioning shoulder, so that the optical fiber plugging rod canelastically insert into the optical fiber output interface, avoiding thedamage of head portion of the optical fiber ferrules at the bottom. Inaddition, there is a downward force after insertion, so that thecoupling between the fiber ferrules is tight enough without loosening.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a three-dimensional schematic diagram illustrating thestructure of the wavelength conversion device according to example 1 ofthe disclosure.

FIG. 2 is a three-dimensional schematic diagram illustrating thestructure of the optical fiber plug of the wavelength conversion deviceaccording to example 1 of the disclosure.

FIG. 3 is a cross-sectional schematic diagram illustrating the structureof the optical fiber plug of the wavelength conversion device accordingto example 1 of the disclosure, in which the optical fiber plugging rodis located at an extreme position.

FIG.4 is a cross-sectional schematic diagram illustrating the structurethat the optical fiber plugging rod is located at a plugging position,according to the wavelength conversion device of example 1 of thedisclosure.

FIG. 5 is a partial diagram illustrating the structure that the opticalfiber plugging rod is inserted into the optical fiber output interface,according to the wavelength conversion device of example 2 of thedisclosure.

FIG. 6 is a three-dimensional schematic diagram illustrating thestructure of the wavelength conversion device according to example 2 ofthe disclosure.

FIG. 7 is a schematic diagram illustrating the structures of the opticalfiber displacement disk and micro-switch device of the wavelengthconversion device according to example 2 of the disclosure.

FIG. 8 is a perspective structural diagram of the micro-switch device ofthe wavelength conversion device according to example 2 of thedisclosure.

FIG. 9 shows a working flowchart of the wavelength conversion device ofthe disclosure.

FIG. 10 is a three-dimensional schematic diagram illustrating thestructure of exchangeable laser array that can be connected with thewavelength conversion device of the disclosure.

FIG. 11 is a schematic diagram illustrating the mechanical coupling andswitching principle in optical fibers between the exchangeable laser andthe wavelength conversion device of the disclosure.

FIG. 12 is a three-dimensional schematic diagram illustrating thestructure of exchangeable laser that can be connected with thewavelength conversion device of the disclosure.

FIG. 13 is a cross-sectional schematic diagram from the right viewillustrating the structure of exchangeable laser that can be connectedwith the wavelength conversion device of the disclosure.

FIG. 14 is a schematic diagram from the front view illustrating thestructure of exchangeable laser that can be connected with thewavelength conversion device of the disclosure.

FIG. 15 is a three-dimensional schematic diagram illustrating thestructure of the cartridge receiver of exchangeable laser that can beconnected with the wavelength conversion device of the disclosure.

FIG. 16 is a cross-sectional schematic diagram from the right viewillustrating the cartridge receiver of exchangeable laser that can beconnected with the wavelength conversion device of the disclosure.

FIG. 17 is a three-dimensional schematic diagram illustrating thestructure of the clamping unit of exchangeable laser that can beconnected with the wavelength conversion device of the disclosure.

FIG. 18 is a schematic diagram illustrating the structure of theexchangeable laser that can be connected with the wavelength conversiondevice of the disclosure in which the clamping unit is not clamped tothe cartridge receiver.

FIG. 19 is a schematic diagram illustrating the structure of theexchangeable laser that can be connected with the wavelength conversiondevice of the disclosure in which the clamping unit is clamped to thecartridge receiver.

FIG. 20 is a schematic diagram illustrating an optical interface of theexchangeable laser that can be connected with the wavelength conversiondevice of the disclosure.

LIST OF REFERENCE SYMBOLS

1, cartridge receiver; 11, electrical interface; 12, optical interface;121, tapered cavity; 122, small cylindrical cavity; 123, largecylindrical cavity; 124, optical fiber ferrule; 125, convex lens; 13,cylindrical slot; 14, buckle slot; 15, heat sink; 151, cooling inlet forheat sink; 16, horizontal positioning groove; 17, anti-slip groovestructure; 18, display device; 2, housing; 21, first accommodatingspace; 211, insertion port; 2111, plugging cartridge receiver groove;212, clamping port; 213, horizontal positioning protrusion; 22, clampingunit; 221, clip-lock assembly; 2211, clip-lock panel; 22111, inclinedguide groove; 22112, inclined strip-shaped groove; 2212, elasticassembly; 222, button assembly; 2221, release button; 2221 a, verticalstrip-shaped groove; 2222, frame connector; 22221, upper rod; 22222,lower rod; 22223, left rod; 22224, right rod; 223, clamping box; 2231,inclined guide rail; 23, second accommodating space; 24, cylindricalprotrusion; 25, optical joint; 251, tapered adapter; 252, externaloptical fiber; 253, external optical fiber ferrule; 254, cylindricaladapter; 26, buckle; 27, forced air cooling inlet; 28, forced aircooling outlet; 29, electrical input joint; 3, wavelength conversiondevice; 31, optical fiber input interface; 32, optical fiber outputinterface; 33, base; 331, baseplate; 3311, output port; 332, stationaryshaft; 34, optical fiber plug; 341, optical fiber plugging rod; 3411,vertical positioning groove; 342, driven gear; 3421, screw-nut pair;3422, optical fiber plugging rod bearing; 343, spring; 344, springpositioning shoulder; 35, drive gear; 36, optical fiber displacementdisk; 361, optical fiber plugging port; 362, micro-switch positioningslot; 37, micro-switch device; 371, micro-switchgear; 3711, micro-slot;372, micro-switch element; 373, micro-motion spring; 374, limiting ball;375, micro-motion rod

DETAILED DESCRIPTION

Reference will now be made in detail to exemplary embodiments, examplesof which are illustrated in the accompanying drawings, in order tofacilitate the understanding of the disclosure. The followingdescription and the accompanying drawings only show preferred examples,and the disclosure may be embodied in many different forms and notlimited to the examples described herein. Rather, these examples areprovided for fully understanding of the present disclosure. Inparticular, the directional terms used in the disclosure, such as“upper”, “lower”, “before”, “after”, “left”, “right”, “inside”,“outside”, “side” are only referred to the orientation in accompanyingdrawings. It should be understand that the directional terms are used toillustrate the disclosure, and are not intended to limit the disclosure.

EXAMPLE 1

The switching of wavelengths can be implemented in a variety of ways.For example, the output wavelength can be selected by coupling anall-in-one optical fiber coupler to one output optical fiber andcontrolling the output wavelength of the laser array, or multiplewavelengths can be multiplexed and selected through a wavelengthdivision multiplexer (WDM). The wavelength conversion device of thepresent disclosure controls the coupling and switching of the pluralityof optical fibers to one or more optical fibers.

To ensure the efficiency of optical fiber coupling, as shown in FIGS.1-9 , it is required the precise alignment effect among the opticalfiber plugs 34 and optical fiber output interfaces 32. In order toachieve this effect, it is necessary to optimize the simple displacementmotion into a cyclic motion ofdisplacement-insertion-extraction-displacement, or to simulate theaction of manually inserting an optical fiber interface by mechanicalautomatic motion. In order to achieve the above complex motions, thepresent disclosure adopts the following scheme.

As shown in FIGS. 1-9 , a wavelength conversion device 3 is provided.The wavelength conversion device 3 includes a plurality of optical fiberinput interfaces 31 and one fiber output interface 32, and also includesa base 33 and a plurality of optical fiber plugs 34. The base 33includes a baseplate 331 and a stationary shaft 332 extending upwardalong a center of the baseplate 331. The stationary shaft 332 is fixedwith a drive gear 35 and an optical fiber displacement disk 36 thatcoincide with an axis of the stationary shaft 332 from bottom to top.The base 33 is not rotatable and movable, and is a center where thewavelength conversion device 3 is fixed to the other peripheral devices.Preferably, a bearing is provided between the drive gear 35 and/or thefiber displacement disk 36 and the stationary shaft 332.

As shown in FIGS. 2-4 , the optical fiber plugs 34 include optical fiberplugging rods 341, driven gears 342 disposed at a periphery of theoptical fiber plugging rods 341 and meshing with the drive gear 35. Theoptical fiber insertion rod 342 is provided with an optical fiber at anaxial position thereof. One end of the optical fiber plugging rod 342 isconnected to the optical fiber input interface 31, and the other end ofthe optical fiber plugging rod is connected to the optical fiber outputinterface 32; and vice versa.

Preferably, the optical fiber plugs 34 are uniformly or axisymmetricallydisposed on the optical fiber displacement disk 36 at a radial peripheryof the drive gear 35. Several output ports 3311 for spirally connectingthe optical fiber output interfaces 32 are disposed on the baseplate 331vertically corresponding to the optical fiber plugs 34. The opticalfiber output interface 32 is provided with an external thread forspirally connecting the output ports 3311, adaptively.

Several optical fiber plugging ports 361 for positioning the opticalfiber plugs 34 are disposed on the optical fiber displacement disk 36 ata radial periphery of the drive gear 35.

When the optical fiber plugging rods 341 are located above the baseplate331, the optical fiber displacement disk 36 will be rotated under anaction of the drive gear 35 and driven gear 342, and thus the opticalfiber plugs 34 will be rotated about the axis of the stationary shaft332; when the optical fiber plugging rods 341 are rotated about the axisof the stationary shaft 332 and are rotated above the output ports 3311,the optical fiber plugging rods 341 will be moved up or down along theoptical fiber plugging ports 361 under the action of the drive gear 35and driven gear 342, so as to pull out from the output ports 3311 orinsert into the optical fiber output interfaces 32.

A large drive gear 35 and a small driven gear 342 are used to form amain transmission structure, and the optical fiber plugs 34 are disposedat a center of the small driven gear 342. When a central shaft of thedriven gear 342 is unmovable, the rotation of the drive gear 35 willdrive the driven gear 342 to rotate, and the rotation of driven gear 342will drive the optical fiber insertion rod 341 to move up and down,thereby completing a insertion-extraction operation of the optical fiberinsertion rod 341. When the central shaft of the driven gear 342 ismovable, i.e., when the optical fiber plugging rod 341 is completelyabove the baseplate 331, the driven gear 35 will be locked with theoptical fiber plug 34 and thus they both cannot be rotated about theirown axis, the driven gear 342 will drive the fiber displacement plate 36to rotate along the drive gear 35 under the action of the drive gear 35,thereby realizing the rotational translation of the optical fiber plugs34.

Preferably, the driven gear 342 is connected to the optical fiberplugging rods 341 through a screw-nut pair 3421. On the optical fiberplugging rods 341, lower portions of the optical fiber plugging rods 341are provided with vertical positioning slots 3411 matching withpositioning protrusions of the optical fiber plugging ports 361. Thevertical positioning slots 3411 are locked with the positioningprotrusions in the optical fiber plugging ports 361, so that the opticalfiber plugging rods 341 do not rotate relative to the optical fiberdisplacement disk 36. A screw external thread matching with a screwinternal thread of the driven gear is provided on the optical fiberplugging rods 341 below the vertical positioning slots 3411. When thedriven gear 342 is rotated, the screw-nut pair 3421 will push theoptical fiber plugging rods 341 to move up and down.

Preferably, an optical fiber plugging rod bearing 3422 is providedbetween the driven gear 342 and the optical fiber plugging rods 341. Theoptical fiber plugging rod bearing 3422 is composed of at least twobearings capable of withstanding axial opposite forces. In this example,there are three optical fiber plugging rod bearings 3422, which ensuressmooth rotation and smooth movement up and down.

The drive gear 35 may be disposed between, above or below the baseplate33 and the optical fiber displacement disk 36, and the position thereofmay be flexibly adjusted as needed.

Preferably, a lower portion of the screw internal thread is providedwith a spring 343 and a spring positioning shoulder 344. Preferably,below the spring positioning shoulder 344 is an optical fiber ferruleconnected to the optical fiber output interface 32.

The arrangement of the spring 343 and the spring positioning shoulder344 enable the optical fiber plugging rod 341 to be elastically insertedinto the optical fiber output interface 32, avoiding the damage of headportion of the optical fiber ferrules at the bottom. In addition, thereis a downward force after insertion, so that the coupling between thefiber ferrules is tight enough without loosening.

Preferably, the screw internal thread of the driven gear 342 is longerthan the screw external thread of the optical fiber plugging rod 341.When a top of the screw external thread abuts against a top of the screwinternal thread, and/or when a bottom of the vertical positioning slot3411 abuts against the bottom of the vertical positioning protrusion ofthe optical fiber plugging port 361, the bottom of the optical fiberplugging rod 341 will be located at least completely above the baseplate331, so that the optical fiber plugging rod 341 is retracted from theoptical fiber output interface 32 under the action of drive gear anddriven gear, and is retracted to such as an extreme position shown inFIG. 13 . When the screw external thread reaches the upper end of thescrew internal thread, and/or the positioning protrusion of the opticalfiber plugging port 361 reaches the bottom of the vertical positioningslot 3411 on the fiber plugging rod 341, the driven gear 342 will not beable to rotate along its own axis, and the fiber displacement plate 36will be rotated under the drive of the drive gear 35. The extremeposition of the optical fiber plugging rod 341 is defined at where thescrew external thread reaches the upper end of the screw internalthread, and/or the positioning protrusion of the optical fiber pluggingport 361 reaches the bottom of the vertical positioning slot 3411 on thefiber plugging rod 341. The docking position of the fiber plugging rod341 and the optical fiber output interface 32 is accurately positionedby the number of turns of the drive gear 35 in the reverse direction.

EXAMPLE 2

Preferably, as shown in FIGS. 6-8 , the wavelength conversion device 3further includes a micro-switch device 37 disposed above the opticalfiber displacement disk 36. The micro-switch device 37 includes amicro-switchgear 371, a plurality of micro-switch elements 372, amicro-motion spring 373, a limiting ball 374 and a micro-motion rod 375.The micro-switchgear 371 is provided with micro-slots 3711. Themicro-motion spring 373, limiting ball 374 and micro-motion rod 375 aredisposed inside the micro-slots 3711. In addition, the micro-motionspring 373 is sleeved on the micro-motion rod 375, and one end of themicro-motion rod 375 abuts against a triggering part of the micro-switchelement 372, and the other end abuts against the limiting ball 374.Micro-switch positioning slots 362 with the same angle as the opticalfiber plugs 34 are disposed on the optical fiber displacement disk 36.When the optical fiber displacement disk 36 is rotated, the limitingball 374 will be moved from one micro-switch positioning slot 362 to anadjacent micro-switch positioning slots, and at the same time, theoptical fiber plug 34 will be moved from an upper position of one outputport 3311 to an upper position of an adjacent output port. Specifically,the optical fiber plugging ports 361 are axisymmetrically disposed onthe optical fiber displacement disk 36, and micro-switch positioningslots 362 are adaptively disposed in a radial direction of the opticalfiber displacement disk 36 in which the optical fiber plugging ports 361are located, so as to ensure that the optical fiber plug 34 can beaccurately positioned above the output ports 3311 when the optical fiberdisplacement disk 36 is rotated.

This structure has two main functions: 1. when the optical fiber plug 34is aligned with the optical fiber output interface 32 of the baseplate331 and is completely located above the baseplate 331, the limiting ball374 is rolled into the micro-switch positioning slots of optical fiberdisplacement disk 36 under the motion of the micro-motion spring 373.After that, the rotation of the optical fiber displacement disk 36 isstopped due to an increase in resistance. The rotation of the drive gear35 causes the optical fiber plug 34 to rotate along its own axis, andcauses the optical fiber plugging rod 341 to move downward until it isinserted into the optical fiber output interface 32 of the baseplate331. 2. The drive gear 35 is backward rotated, so that the optical fiberplug 34 is driven away from the optical fiber output interface 32 andretracted to the uppermost position. After that, the rotationalresistance of the driven gear 342 is increased, and thus the limitingball 374 is forced to be disengaged from the micro-switch positioningslot 362 on the upper surface of the optical fiber displacement disk 36.Therefore, the optical fiber plug 34 is driven by the drive gear 35 tobe displaced to the next optical fiber output interface.

The limiting ball 374 is connected to the triggering unit of themicro-switch elements 372 via the micro-motion rod 375 and themicro-motion spring 373. When the limiting ball 374 is disengaged fromthe micro-switch positioning slot 362 of the optical fiber displacementdisk 36, the position of the limiting ball rises, touching themicro-switch elements 372 to turn the switch on; when the limiting ball374 enters the micro-switch positioning slot 362 of the optical fiberdisplacement disk 36, the position of limiting ball drops, and thus themicro switch element 372 will be turned off. According to the signal ofthe micro-switch elements 372, it can be determined whether or not thelimiting ball 374 is in the micro-switch positioning slot 362, so as tocontrol the rotation direction of the drive gear 35.

The wavelength conversion device 3 can realize a coupling switchingoutput of wavelength in which the plurality of optical fiberstransmitting lase with different wavelength input, but one wavelengthoutputs by using the drive gear 353. When the input and output fiberinterfaces are increased, it is only required to install more opticalfiber plugs 34 and optical fiber joints for coupling these plugs. Thisavoids the control complexity and the reduction of coupling precisioncaused by the use of the plurality of rotation and displacement controldevices when the number of fiber interfaces increases. The output of thewavelength conversion device 3 described above can be used not only withone output optical fiber, but also with two or more optical fiberoutputs, the principle of which is similar to that of one optical fiber.

The working flowchart of the wavelength conversion device 3 is shown inFIG. 9 .

Before the start state, the optical fiber plugging rod 341 is completelylocated above the baseplate, and the screw external thread reaches theupper end of the screw internal thread and/or the positioning protrusionof the fiber plugging port 361 reaches the bottom of the verticalpositioning slot 3411 on the fiber plugging rod 341. That is, theoptical fiber plugging rod 341 is positioned at the extreme position(i.e., the optical fiber plugging rod 341 is pulled out to the extremeposition in the upward direction), the limiting ball 374 is located inthe micro-switch positioning slot 362.

In the first stage, the rotation of the optical fiber displacement disk36 drives the optical fiber plug 34 to move from the current opticalfiber output interface 32 to the next optical fiber output interface.Specifically, the drive gear 35 is controlled to rotate in the forwarddirection, which drives the optical fiber displacement disk 36 torotate, removes the limiting ball 374 from the micro-switch positioningslot 362, and thus turns on the micro-switch element 374. The limitingball 374 is snapped into the next micro-switch positioning slot of theoptical fiber displacement disk 36 under the rotation of the opticalfiber displacement disk 36, and the micro-switch element 374 is turnedoff. The turning on or off of the micro-switch element controls thebackward rotation of drive gear 35.

In the second stage, the optical fiber plugging rod 341 of the opticalfiber plug 34 is moved downwardly to dock with the optical fiber outputinterface 32. Specifically, the drive gear 35 is backward rotated, androtated in a certain turns, which drives the optical fiber plugging rod341 to move downwardly to the optical fiber output interface 32 andlaser-coupled output to the photodynamic therapy device for photodynamictherapy.

In the third stage, the optical fiber plugging rod 341 of the opticalfiber plug 34 is moved upwardly to the extreme position. Specifically,when the treatment is completed, the drive gear 35 is controlled torotate in the forward direction, and the optical fiber plugging rod 341is moved upwardly and gradually removed from the optical fiber outputinterface 32, is finally moved to the position before the start statedescribed above, so as to complete a use period.

The control of the forward rotation of the drive gear may be performedby a control system provided in the wavelength conversion device 3, ormay be performed by the photodynamic therapy device. Specifically, astart switch may be provided on the control system manipulationinterface of the wavelength conversion device 3 or on the controlinterface of the photodynamic therapy device. The drive gear isconverted from forward rotation to forward rotation during a completeturning on and off of the micro-switch element 37.

EXAMPLE 3

The optical fiber input interface 31 of the wavelength conversion deviceof the present disclosure may be directly connected to the output fiberof the laser, or the optical fiber input interface 31 may be directlyconnected to the laser output of the laser.

Preferably, the wavelength conversion device of the present disclosurecan perform a mechanical coupling and switching of optical fibersbetween the exchangeable laser as shown in FIG. 10 and the optical fiberinput interface 31 of the wavelength conversion device, the principlethereof as shown in FIG. 11 . Through the relative positional changeamong the optical fiber output interface 32 and the plurality of fiberoptical plugs 34 that are connected to the plurality of optical fibers,when a certain input optical fiber is aligned with the optical fiberoutput interface 32, laser in the optical fiber connected to thisoptical fiber plug is output, so as to realize switching of differentwavelength outputs.

An exchangeable laser array that can be connected to the wavelengthconversion device of the present disclosure is provided. Theexchangeable laser array includes a plurality of exchangeable lasers,and in each of exchangeable lasers, a left side and right side of thehousing are respectively provided with a horizontal guide channel arrayand a horizontal guide rail array. A plurality of exchangeable laserscan be snap-fitted side-by-side through the horizontal guide channelarray and horizontal guide rail array, and it is easy to disassemble andreplace the exchangeable lasers. The exchangeable laser array iscomposed of the plurality of exchangeable lasers that have the uniformshape and uniform output interfaces and the housings 2 with the sameoptical fiber joints 25 and electronic joints. The optical fiber joints25 of the housings 2 are directly or indirectly connected to externaloptical fibers, so as to output lasers having multiple wavelengthsthrough different optical fibers to different instruments such asphotodynamic therapy devices or dedicated wavelength conversion devices3. In particular, as shown in FIG. 10 , there are four housings 2, andtwo cartridge receivers 1. According to the above manner, thereplaceable laser array of the disclosure can realize the quick andconvenient disassembly and assembly of the cartridge receiver 1 (i.e.,the laser element). The replacement of the laser element can achieve theswitch of different output wavelengths. For example, if there is only alaser element with two emission wavelengths of 630 nm and 664 nm in thecartridge receiver, while Foscan photosensitizer is temporarily used fortreatment (the treatment wavelength is 652 nm) during the treatment,then it will be only required to purchase a cartridge receiver 1 with aemission wavelength of 652 nm, and insert it into a housing in vacant.

The electrical interface of each exchangeable laser of the exchangeablelaser array can be connected to the power and control systems of aphotodynamic therapy device, and thus is powered and controlled by thephotodynamic therapy device. The optical fiber output interface of theexchangeable laser array is connected to an external optical fiber. Inthis example, the array including four housings is connected with fourexternal optical fibers. These external optical fibers can be directlyconnected with a wavelength conversion device to realize selectiveoutput of the wavelength, or respectively connected with differentphotodynamic therapy devices.

EXAMPLE 4

An exchangeable laser is provided, as shown in FIGS. 12-20 . Theexchangeable laser includes a cartridge receiver 1 in which a laserelement is fixed and a housing 2 for clamping the cartridge receiver 1.The cartridge receiver 1 has one electrical interface 11 and severaloptical interfaces 12 for docking with the housing 2. The cartridgereceiver 1 can be withdrawn from the housing 2 and replaced with anothercartridge receiver including a laser element that emits laser ofdifferent wavelength. Since there are many drawings in the disclosure,the word “front” refers to the position of the insertion port when thecartridge receiver is inserted into the housing in FIGS. 10-20 for theunified identification. That is, the position of the front panel of thehousing is referred as “front”, and the position of the back panel ofthe housing opposite thereto is referred as “back”. Specifically, thecoordinate system in FIG. 10 is that the direction indicated by theX-axis is referred as “front”, the direction indicated by the Y-axis isreferred as “right”, and the direction indicated by the Z-axis isreferred as “upper”.

Specifically, the housing 2 includes a first accommodating space 21 foraccommodating the cartridge receiver 1, a clamping unit 22, and a secondaccommodating space 23 for accommodating the clamping unit. A frontpanel of the housing 2 is provided with an insertion port 211 forhorizontally inserting the cartridge receiver 1 into the firstaccommodating space 21. The cartridge receiver 1 is detached andreplaced via the insertion port 211. The second accommodating space 23is disposed below the first accommodating space 21 and is communicationwith the first accommodating space 21 through a clamping port 212provided on a bottom panel of the first accommodating space 21.

The clamping unit 22 includes a clip-lock assembly 221 and a buttonassembly 222. The clip-lock assembly 221 includes clip-lock panel 2211disposed horizontally and an elastic assembly 2212 disposed under theclip-lock panel 2211. An upper panel of the clip-lock panel 2211 isprovided with a plurality of cylindrical protrusions 24 whose axes areinclined rearward, and a corresponding lower panel of the cartridgereceiver 1 is provided with a plurality of cylindrical slots 13 havingthe same shape as the cylindrical protrusions 24. Interiors of thecylindrical protrusions 24 and cylindrical slots 13 are respectivelyprovided with male and female electrical interfaces that can match witheach other. The cylindrical protrusions 24 pass upward through theclamping port 212 and snap into the cylindrical slots 13 under an actionof the elastic assembly 2212, so as to power the laser element andassist in adjusting parameters of the laser element. Preferably, theelectrical interfaces of cylindrical protrusions 24 are connected with apower supply and/or a parameter control device for adjusting the laserelement through the electrical output joint 29 arranged on the housing2. Electrical interfaces 11 of the cylindrical slots 13 are respectivelydirectly connected to a port of the power supply inside the laserelement and/or parameter control interfaces including an interface foradjusting power, an interface for adjusting wavelength, and an interfacefor adjusting a pulse.

Specifically, as shown in FIGS. 6-8 , when the button assembly 222 movesbackward, the clip-lock panel 2211 is driven to move obliquely downwardalong an axial direction of the cylindrical protrusion 24, the elasticassembly 2212 is switched from a natural state to an energy storagestate, and the cylindrical protrusions 24 disengage from the cylindricalslots 13, thereby causing the cartridge receiver 1 to be disengaged fromthe clip-lock panel 2211. This facilitates the withdrawal of thecartridge receiver 1 from the insertion port 211 and the arrangement ofother cartridge receiver having the same structure but including adifferent laser element that emits laser of different wavelength. Thatis, the switching of the wavelength of the laser element can becompleted by simply switching the cartridge receiver 1. When the othercartridge receiver is arranged into the first accommodating space 21 andthe button assembly 222 is released (the button assembly 222 is resetforward), the elastic assembly 2212 is switched from the energy storagestate to an energy release state, and the clip-lock panel 2211 is movedobliquely upward along the axial direction of the cylindricalprotrusions 24 under the action of the elastic assembly 2212, until thecylindrical protrusions 24 engage with the cylindrical slots 13, therebypowering the laser element and/or performing the adjustment of laserelements parameters.

The exchangeable laser of the disclosure is composed of the cartridgereceivers 1 and the housing 2 for clamping the cartridge receivers 1, inwhich the cartridge receivers 1 all have a uniform shape, uniformelectrical interface 11 and the optical interfaces 12 and include laserelements inside. The laser element inside each of the cartridgereceivers 1 may be composed of a semiconductor laser, a solid laser, agas laser or other kinds of laser elements. Laser is output through thesame optical joint 25 provided at the back of the housing 2. The powersupply and parameter control of the laser element are realized by theelectronic interfaces of the cylindrical protrusions 24 with theinclined angles of clip-lock panel 2211 and cylindrical slots 13 of thecartridge receiver 1. In addition, the cylindrical protrusions 24 withthe inclined angles and cylindrical slots 13 with the inclined anglescan realize the precise positioning of the housing 2 and the cartridgereceiver 1. When replacing one laser element by a laser element thatemits laser with a different wavelength, it is only necessary towithdraw the cartridge receiver 1 from the housing 2, and replace itwith another cartridge receiver 1 that includes laser element emittinglaser with the different wavelength. Therefore, the replacement of thelaser elements is converted to the replacement of cartridge receivers 1that include a different laser element emitting laser with differentwavelength, and have consistent shapes, consistent electrical interfacesand optical interfaces, which greatly reduces the difficulty for medicalpersonnel to switch laser wavelengths, and improves the popularizationof laser therapeutic instruments in the medical field.

EXAMPLE 5

Preferably, this example differs from the above example in that: inorder to achieve accurate connection of the optical interfaces and theelectrical interfaces between the cartridge receiver 1 and the housing2, the clamping unit 22, as shown in FIG. 17-19 , further includes aclamping box 223. The clamping box 223 is fixed to the secondaccommodating space 23. In addition, a lower portion of the elasticassembly 2212 is fixed to a bottom of the clamping box 223. When theclip-lock panel 2211 is moved up and down, the clip-lock panel is notcompletely detached from the clamping box 223. A left and right sides ofthe clamping box 223 are respectively provided with a plurality ofinclined guide rails 2231 having the same inclination degree as the axisof the cylindrical protrusion 24, and a left and right sides of theclip-lock panel 2211 corresponding to the clamping box are provided withinclined guide channels 22111 respectively. Alternatively, the left andright side surfaces of the second accommodating space 23 are preferablyprovided with a plurality of inclined guide rails having the sameinclination degree as the axis of the cylindrical protrusion 24, and theleft and right sides of the clip-lock panel 2211 corresponding to thesecond accommodating space are provided with inclined guide channels. Inaddition, the lower portion of the elastic assembly 2212 is fixed to abottom of the second accommodating space 23. When the clip-lock panel2211 is moved up and down, the clip-lock panel 2211 is not completelydetached from the inclined guide rails.

Preferably, the button assembly 222 includes a release button 2221arranged at the front panel of the housing 2 corresponding to the secondaccommodating space 23, and a frame connector 2222 arranged behind therelease button 2221. A vertical strip-shaped slot 2221 a is providedbackside of the release button 2221, and an inclined strip-shaped slot22112 is provided frontside of the clip-lock panel 2211. The verticalstrip-shaped slot 2221 a and the inclined strip-shaped slot 22112 haveopenings oriented perpendicular to left and right panels of the housing2, respectively. An inclined direction of the inclined strip-shaped slot22112 is perpendicular to the axis of the cylindrical protrusion 24. Anupper rod 22221 and lower rod 22222 of the frame connector 2222 arerespectively capable of sliding in the inclined strip-shaped slot 22112and the vertical strip-shaped slot 2221 a. A left rod 22223 and rightrod 22224 of the frame connector 2222 are horizontally hinged to theleft and right panels of the clamping box 223, respectively. When therelease button 2221 moves backward, the vertical strip-shaped slot 2221a moves backward, which allows the lower rod 22222 of the frameconnector 2222 rotating obliquely backward in the vertical strip-shapedslot 2221 a, and in turn allows the upper rod 22221 of the frameconnector 2222 rotating obliquely forward in the inclined strip-shapedslot 22112. At the same time, a force direction of the inclinedstrip-shaped slot 22112 is always the same as an inclination directionof the cylindrical protrusion 24, which allows the clip-lock panel 2211to move downward along the inclination direction of the cylindricalprojection 24.

Preferably, the clamping unit 22 further includes a buckle 26 disposedon the upper portion of the clip-lock panel 2211 and located in front ofthe cylindrical protrusion 24, and a buckle slot 14 is provided underthe lower panel of the cartridge receiver 1 at a position correspondingto a position of the buckle. When the back panel of the cartridgereceiver 1 is connected with the back panel of the housing 2, the buckle26 exactly snaps into the buckle slot 14, and the male and femaleelectrical interfaces inside the cylindrical protrusion 24 and thecylindrical slots 13 corresponding to the cylindrical protrusion areconnected with each other, preventing the cartridge receiver 1 fromslipping out of the housing 2 during use.

Preferably, an upper back portion of the cartridge receiver 1 is furtherprovided with a heat sink 15 of the laser element. Preferably, a middleportion of the heat sink 15 is provided with a cooling inlet 151 forheat sink penetrating vertically, and the upper panel of the housing 2is provided with a forced air cooling inlet 27 at a positioncorresponding to a position of the cooling inlet 151 for heat sink. Theleft panel and/or the right panel of the housing 2 are arranged withforced air cooling outlets 28. In addition, as a preferred solution, thehousing 2 also has a forced air cooling outlet 28 at a positioncorresponding to the back panel of the heat sink 15. As shown in FIGS.12-16 , the heat sink 15 has a sheet-like multi-layer structure. Anexternal active air-cooling device enters the air through the forced aircooling inlet 27, allowing the air to flow vertically and horizontallyto the forced air cooling outlet 28 to perform forced wind cooling ofthe heat sink 15.

The front panel of the cartridge receiver 1 is provided with a displaydevice or a warning light 18 to prompt completion of the connectionafter the laser element is ready for connection and to prompt that thelaser is being outputted when the laser element is working.

Preferably, the optical interface 12 has a concave tapered cavity forcooperating with the laser outlet of the laser element, and outputslaser through an optical fiber ferrule. One end of the electricalinterface 11 is connected to the electrical interface of the laserelement, and the other end is connected to the uniform electricalinterface of the housing.

Preferably, the cylindrical protrusions 24 are arrayed on the uppersurface of the clip-lock panel 2211, and the cylindrical slots 13 arearrayed on the lower panel of the cartridge receiver 1, corresponding tothe array of the cylindrical protrusions. Specifically, as shown inFIGS. 17-19, 18 cylindrical slots 13 are arrayed on the lower panel ofthe cartridge receiver 1 in two rows at an angle of 45° with thehorizontal plane. Each of the cylindrical slots 13 is provided with anannular barrel-shaped metal ferrule, and the center of the metal ferrulehas a cavity structure. In this example, the cavity has a diameter of 3mm and a length of 5 mm, allowing the insertion of a needle-like pininside the cylindrical protrusion 24. Correspondingly, 18 cylindricalprotrusions 24 are arrayed on the upper panel of the fastening panel intwo rows at an angle of 45° with the horizontal plane. The cylindricalprotrusions 24 are internally provided with electrical pins for matchingthe internal structure of the cylindrical slots 13. After the cartridgereceiver 1 is inserted into the first accommodating space 21 of thehousing 2, the cartridge receiver 1 is locked by the clamping unit 22;and when the lock state is released by pressing the release button 2221,the cartridge receiver 1 can be taken out from the first accommodatingspace 21.

When the cartridge receiver 1 is not inserted into the housing 2, theclip-lock panel 2211 and the cylindrical projections 24 are lifted underthe action of the spring assembly 2212. As shown in FIG. 18 , the backpanel of the clip-lock panel 2211 is inclined, and the inclined backpanel always has a portion in contact with an inclined side of theclamping box 223. The inclined surface has the same inclination angle asthat of the axis of the cylindrical protrusion 24. When inserting thecartridge receiver 1, the release button 2221 is pressed, and theinclined panel of fastening panel 2211 is forced to move downward, whilethe cylindrical protrusion 24 and the electrical ferrule inside thereofare moved downward, so that the cartridge receiver 1 can be inserted.After the cartridge receiver 1 is inserted to reach a certain depth, forexample, the back panel of the cartridge receiver 1 abuts against to theback panel of the housing 2 or the back panel of the cartridge receiver1 abuts against the positioning block disposed on the back panel of thehousing 2, as shown in FIG. 19 , the release button 2221 is released,the clip-lock panel 2211 is bounced, and the cylindrical protrusion 24and the electrical ferrule inside thereof are inserted into thecylindrical slots 13 and the electrical ferrule, to realize thecommunication of the circuit. At the same time, the optical interfaces12 are cooperated to achieve optical communication. Under the action ofthe elastic assembly 2212, such as a spring, the cartridge receiver 1 issubjected to a rearward force to press the electrical interface 11 andoptical interfaces 12. In addition, under the restriction of the buckle26, the cartridge receiver 1 cannot be loosened or accidentally takenout.

EXAMPLE 6

Preferably, a back panel of the housing 2 is provided with an opticaljoint 25 at a position of the back panel horizontally corresponding tothe insertion port 211, and the cartridge receiver 1 is provided with anoptical interface 11 for matching the optical joint at a positioncorresponding to the optical joint 25. The optical interface 11 isinternally connected to the laser output port of the cartridge receiver1 via an optical fiber. Different cartridge receivers 1 are designed tohave the same optical interfaces 11 and electrical interfaces 12, whichgreatly reduces the difficulty for medical personnel to switch laserwavelengths, and improves the popularization of laser therapeuticinstruments in the medical field.

In particular, as shown in FIG. 20 , the optical interface 12 of thecartridge receiver 1 includes a tapered cavity 121 with a cone top atfront and an axis extending rearward. A small cylindrical cavity 122 isarranged extending horizontally forward from the cone top of the taperedcavity 121 and is communication with the tapered cavity; a bigcylindrical cavity 123 is arranged extending horizontally backward froma cone bottom of the tapered cavity 121. A front side of the smallcylindrical cavity 122 is directly connected a laser output of the laserelement, or connected to the laser output of the laser element throughan optical fiber ferrule 124.

The back panel of the housing 2 is provided with an optical joint 25(i.e., an optical connector) capable of matching with the opticalinterface of the cartridge receiver. As shown in FIG. 13 , the opticaljoint 25 includes a tapered adapter 251 having the same shape as thetapered cavity 121, and an external optical fiber 251 disposed insidethe tapered adapter 251. A front end of the external optical fiber 251is provided with an external optical fiber ferrule 253 capable ofinserting into the small cylindrical cavity 122. The external opticalfiber ferrule 253 is arranged at a front end of the tapered adapter 251,and a cylindrical adapter 254 with the same shape as the largecylindrical cavity 123 is arranged extending forwardly from a back endof the tapered adapter 251. The cylindrical adapter 254 may extend to beflush with the back panel of the housing 2.

A top portion of the optical fiber ferrule 124 has a lens 125, and thelens is a convex lens or a lenticular lens or a graded-index lens. Whenthe optical interface 12 is mated with the optical joint 25, a distancebetween a front end face of an optical fiber of the external opticalfiber ferrule 253 and the lens is equal to a focal length of the lens,or half of it or an integral multiple thereof, collimating the divergentlight emitting from the optical fiber. In this example, a core diameterof the optical fiber is 400 μm, and the optical fiber ferrule has adiameter of 3 mm, and the lens is a convex lens 125. The cylindricalcavity allows the insertion of the external optical fiber ferrule.

The optical fiber ferrule of the laser element outputs laser in acollimated manner, and is coupled with the optical fiber ferrule insidethe housing 2, so as to output laser through the external optical fiber252. There is a gap between the top end of the optical fiber ferrule ofthe laser element and the top end of the external optical fiber ferrule253 of the housing 2, preventing the top end of the optical fiberferrule from being damaged by the external force collision. The gap maybe in a size of 10 μm-1000 μm. In this example, this gap is 500 μm.

Preferably, the tapered cavity has a taper angle of 45°. The arrangementof the tapered adapter 251 and the tapered cavity 121 having the taperangle of 45° as well as the mechanical structures of the largecylindrical cavity 123 and the cylindrical adapter 254, enable theoptical fiber ferrule 124 of the laser element and the external opticalfiber ferrule 253 can be precisely docked with each other.

FIG.10 shows the structure of the cartridge receiver 1 when it is notinserted into the housing 2. Preferably, the first accommodating space21 and the cartridge receiver 1 have a same shape. The left panel andthe right panel of the cartridge receiver 1 are provided with horizontalpositioning grooves 16, and the left panel and the right panel of thefirst accommodating space 21 corresponding to the left panel and theright panel of the cartridge receiver 1 are provided with horizontalpositioning protrusions 213.

Preferably, a front portion of the left panel and the right panel of thecartridge receiver 1 is provided with an anti-slip groove structure 17,and the insertion port 211 further includes plugging cartridge receivergrooves 2111 corresponding to the anti-slip groove structure 17 in frontof the left panels and right panel of the housing 2. This is convenientfor the user to remove the cartridge receiver 1 from the housing 2 byhand.

It should be noted that the above description is only intended to enablethose skilled in the art to more fully understand the present disclosurewithout limiting the present discourse in any way. It should beappreciated that various modifications and changes can be made to thepresent disclosure, although the present disclosure has been describedabove and illustrated in the accompanying drawings. Any modifications,equivalents, improvements, etc. made within the spirit and scope of thepresent disclosure are intended to be included within the scope of thepresent disclosure.

The invention claimed is:
 1. A wavelength conversion device, comprisinga base and a plurality of optical fiber plugs, wherein the basecomprises a baseplate and a stationary shaft extending upward along acenter of the baseplate, the baseplate is a part of the base and thestationary shaft is perpendicular to the base; wherein along with anaxis of the stationary shaft, the stationary shaft is provided with adrive gear and an optical fiber displacement disk with the axis of thestationary shaft as a rotation axis; each of the optical fiber plugscomprises an optical fiber plugging rod, a driven gear at a periphery ofthe optical fiber plugging rod and meshing with the drive gear; anoptical fiber is provided at an axial center position of the opticalfiber plugging rod, and optical fiber ferrules are provided at both endsof the optical fiber plugging rod and are connected to an optical fiberinput interface and an optical fiber output interface, respectively; aplurality of optical fiber plugging ports for positioning the opticalfiber plugs are disposed on the optical fiber displacement disk at aradial periphery of the drive gear, and a plurality of output ports forspirally connecting the optical fiber output interface are disposed onthe baseplate vertically corresponding to the optical fiber pluggingplugs; when the optical fiber plugging rod is located above thebaseplate, the optical fiber displacement disk is rotated under anaction of the drive gear and the driven gear, thereby driving theoptical fiber plugs to rotate around the axis of the stationary shaft;when the optical fiber plugging rod is rotated around the axis of thestationary shaft to locate above the output port, the optical fiberplugging rod is moved up or down along the optical fiber plugging portunder an action of the drive gear and the driven gear, so as to pull outfrom the output port or insert into the optical fiber output interface,to achieve a mechanical coupling and switching among a plurality ofinput optical fibers and one output optical fiber; when a central shaftof the driven gear is locked, rotation of the drive gear drives rotationof the driven gear, and the rotation of driven gear drives movement ofthe optical fiber plugging rod up and down, thereby completing aninsertion-extraction operation of the optical fiber plugging rod; andwhen the central shaft of the driven gear is unlocked, the driven gearis locked with the optical fiber plug, and neither the central shaft ofthe driven gear nor the driven gear are rotatable about their respectiveaxes, and the driven gear drives rotation of the fiber displacement diskalong the drive gear under action of the drive gear, thereby realizingrotational translation of the optical fiber plugs.
 2. The wavelengthconversion device according to claim 1, wherein the wavelengthconversion device further comprises a micro-switch device disposed abovethe optical fiber displacement disk, and the micro-switch devicecomprises a micro-switchgear, a plurality of micro-switch elementsprovided above the micro-switchgear, a micro-motion spring, a limitingball and a micro-motion rod; a plurality of micro-motion holes areprovided on the micro-switchgear, and the micro-motion spring, thelimiting ball as well as the micro-motion rod are arranged in themicro-motion holes; the micro-motion spring is sleeved with themicro-motion rod; one end of the micro-motion rod abuts against atriggering unit of the micro-switch element, and the other end of themicro-motion rod abuts against the limiting ball; micro-switchpositioning slots with same angle as the optical fiber plugs aredisposed on the optical fiber displacement disk; when the optical fiberdisplacement disk is rotated, the limiting ball moves from onemicro-switch positioning slot to an adjacent micro-switch positioningslot, and at the same time, the optical fiber plug is moved from anupper position of one output port to an upper position of an adjacentoutput port.
 3. The wavelength conversion device according to claim 1,wherein the driven gear of the optical fiber plug is connected to theoptical fiber displacement plate through a bearing housing and a bearingof the bearing housing, and the driven gear is connected to the opticalfiber plugging rod through a screw-nut pair.
 4. The wavelengthconversion device according to claim 3, wherein a screw internal threadof the driven gear has a length longer than a length of a screw externalthread of the optical fiber plugging rod; and the screw internal threadis only screwed inside the screw external thread; an end of the screwexternal thread is provided with a thread stop structure for preventingthe screw internal thread from being screwing out; when a top of thescrew external thread abuts against a top of the screw internal thread,an end portion of the optical fiber ferrule at a lower end is located atleast above the baseplate.
 5. The wavelength conversion device accordingto claim 4, wherein the drive gear and driven gear are arranged betweenthe baseplate and the fiber displacement disk; the optical fiberplugging rod is provided with vertical positioning slots at a topportion of the screw internal thread of the driven gear, and the opticalfiber plugging port corresponded to the optical fiber plugging rod isprovided with vertical positioning protrusions; when a bottom of thevertical positioning slot abuts against a bottom of the verticalpositioning protrusion, a bottom of the optical fiber ferrule at a lowerend is located at least above the baseplate.
 6. The wavelengthconversion device according to claim 5, wherein a lower portion of thescrew external thread is provided with a spring and a spring positioningshoulder.
 7. The wavelength conversion device according to claim 6,wherein the optical fiber ferrule and the optical fiber plugging rod areconnected through a tapered transition piece.
 8. The wavelengthconversion device according to claim 7, wherein the tapered transitionpiece has a taper angle of 45º.
 9. The wavelength conversion deviceaccording to claim 3, wherein at least two bearings capable ofwithstanding axial opposite forces are provided inside the bearinghousing.
 10. The wavelength conversion device according to claim 9,wherein an external thread is provided on the optical fiber outputinterface for spirally connecting the output port.
 11. The wavelengthconversion device according to claim 9, wherein the optical fiber inputinterface is an optical fiber adapter.